By Guy P. Brasseur, Susan Solomon
[…] an attractive and well-written assessment of the present prestige of our wisdom of the composition of the center surroundings and the elemental radiative, dynamical and photochemical approaches which retain it. (Bulletin American Meteorological Society)
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Additional info for Aeronomy of the middle atmosphere: chemistry and physics of the stratosphere and mesosphere, Third Edition
In order to evaluate the feasibility of chemical processes, the enthalpy of reaction must be examined. ), which are conventionally assigned an enthalpy of formation of zero. Consider, for example, the formation of two ground state oxygen atoms, starting from an oxygen molecule. 1). 15 K by convention. If ∆HR0 is negative, heat is liberated by the reaction, and it is called exothermic. If ∆HR0 is positive, heat must be supplied in order for the reaction to proceed, and it is then called endothermic.
7. Typical potential energy curves for a diatomic molecule. 8. Potential energy diagram for the principal states of the oxygen molecule. Adapted from Gilmore (1964). 9. Potential energy curves for a predissociative process in a diatomic molecule. 7, can such a transition lead to dissociation? Dissociation can often occur in such a case through curve crossing onto a predissociating state. 9 presents a corresponding potential energy curve showing this phenomenon. The excited state, XY∗ , which is initially produced, can cross into XY∗∗ by a non-radiative transition or by collisioninduced crossing.
77b) The quantum yield of a given pathway following the light absorption is deﬁned as the number of reactant molecules which decompose along this pathway relative to the number of photons absorbed. The sum of quantum yields for all possible pathways is then unity. 76a). 7 presents a typical potential energy diagram for a diatomic molecule, where possible photon-induced transitions are indicated. At atmospheric temperatures, most molecules are in their ground vibrational state. Possible transitions are represented by the vertical lines labeled 1 and 2, for example.